Steven Yeun (R) and Joana Pak attend a basketball game between the Detroit Pistons and the Los Angeles Clippers at Staples Center on November 7, 2016 in Los Angeles, California. Credit: Noel Vasquez/GC Images

Surprise! Steven Yeun married his longtime girlfriend, Joana Pak, in a romantic wedding ceremony in Los Angeles on Saturday, December 3.

The Walking Dead alum, 32, and the professional photographer tied the knot in front of their closest friends and family members at the historic Paramour Estate. Many of Yeun's former costars were also in attendance, including Norman Reedus, Andrew Lincoln, Melissa McBride, Sarah Wayne Callies, Chandler Riggs, Emma Bell and Alanna Masterson, according to Instagram posts.

Pak's sister Kayce shared a sweet picture of the bride and groom on Instagram, writing, "Getting to celebrate the love between these two, last night, along with all their friends and family was so beautiful and special!! This whole week has been an awesome, family-filled, fun time and it's been so great! (We've also gained a brother in-law from it!) #loveyouguys #pakpack."

Callies, 39, who played Lori Grimes on the AMC drama, shared an Instagram photo of herself with Lincoln's wife, Gael Anderson, before the ceremony. "Wedding ready…," she captioned the post.

The Walking Dead fans last saw eun's beloved character, Glenn Rhee, on the season 7 premiere, which aired on October 23. In the gruesome episode, Glenn and Sergeant Abraham Ford (played by Michael Cudlitz) were brutally murdered at the hands of Negan and his barbed-wire baseball bat, Lucille. The shocking scene sent viewers into a frenzy as they shared their emotional reactions on social media.